65821003 / 40228K016 Issue 1810 Page 1 of 6
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INSTALLATION INSTRUCTIONS
Evaporator Coil
65821003
*65821003*
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
40228K016
These instructions must be read before any installation.
WARNING
Your safety and the safety of others are very important.
We have provided many important safety messages in
this manual and on your appliance. Always read and
obey all safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill
or hurt you and others.
All safety messages will follow the safety alert symbol
and signal word. These signal words mean the following:
DANGER
You can be killed or seriously injured
if you don’t immediately follow
instructions.
WARNING
Indicate a potentially hazardous
situation, which, if not avoided, could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous
situation, which, if not avoided, may
result in minor or moderate injury.
Caution may also be used to alert
against unsafe practices.
NOTICE
Indicates a statement of company
policy as the message relates directly
or indirectly to the safety of personnel
or protection of property.
IMPORTANT
More detailed information concerning
the statement of company policy
as the message relates directly or
indirectly to the safety of personnel or
protection of property.
All safety messages will tell you what the potential
hazard is, tell you how to reduce the chance of injury,
and tell you what can happen if the instructions are not
followed.
65821003 / 40228K016Issue 1810Page 2 of 6
Installation
WARNING
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualied service personnel should install or service
this equipment. Installation and service performed by
unqualied persons can result in property damage,
personal injury, or death.
General
Evaporator coils are designed for use with AC condensing
units or heat pump units. These instructions are intended
as a general guide and do not supersede local codes in
any way. Consult with local authorities having jurisdiction
before installation. This installation must comply with all
local and state laws as well as national electrical codes for
the U.S. or Canada where applicable.
Verify the efciency performance requirements, such
as SEER, EER, and/or HSPF, are appropriate with the
matched condensing or heat pump units. Check outdoor
unit manufacturer for proper line sizing.
WARNING
Coils are shipped with a 10 psi dry air holding charge.
Puncture rubber plug on suction line to release charge
before removing plugs. The absence of pressure does
not verify a leak. Check the coil for leaks before installing
or returning it to your wholesaler.
Inspection of Shipment
Before installation, inspect the coil for any shipping
damage. Notify the carrier or the distributor of any damaged
equipment; do not install a damaged coil.
WARNING
Before performing maintenance operations on system,
turn off all main power switches to indoor and outdoor
units. Turn off accessory heater power switch, if
applicable. Electrical shock could cause personal injury
or death.
Air Leakage
All indoor cabinets MUST be taped after installation to seal
against any air leaks. System performance and efciency
will be reduced if air leakage exists.
Air Filters
Properly-sized air lters MUST be installed on all return air
ducts. If air lters are not used or maintained regularly as
required, equipment damage can occur, system capacity
and efciency will be reduced and the warranty coverage
may be void.
Filter Dryer
A new lter dryer MUST be installed on all systems. The
lter dryer is typically shipped with the outdoor unit; if not,
add one. Do not install more than one lter dryer in the
system; it can reduce the system capacity and efciency.
Metering Device
The indoor coils are shipped with either a piston or
expansion valve (TXV) based on the coil model. The
selection of the metering device type and size must follow
the outdoor unit technical specication and the AHRI listing.
Pistons
The piston shipped with the indoor coil may not be the
correct size for the outdoor unit being installed. The
outdoor unit specication gives the correct size and the
correct piston is usually shipped with the outdoor unit.
To replace the piston with another piston, perform the
following procedure:
1. Loosen the piston housing hex nut on coil liquid tube.
Use TWO wrenches to avoid damage to the distributor
tubes.
2. Replace the existing piston with the new piston
3. Always use a new Teon O-ring
4. Re-assemble the housing and torque to 10-20 ft-lb
using TWO wrenches
65821003 / 40228K016 Issue 1810 Page 3 of 6
Figure 1. Changing an Orice
Expansion Valves (TXV)
Factory shipped coils with installed TXV are available. TXV
kits are also available to convert a piston-shipped coil to
a TXV coil; the kit part number is specic to the outdoor
model (see the outdoor unit technical specication).
For proper TXV installation, follow the installation
instruction provided with the TXV kit in addition to the
following procedure:
1. Loosen the piston housing hex nut on coil liquid tube.
Use TWO wrenches to avoid damage to the distributor
tubes.
2. Replace the existing piston with the new TXV
3. Always use a new Teon O-ring
4. Re-assemble the housing and torque to 10-20 ft-lb
using TWO wrenches
5. Connect the external equalizer tube to the equalizer
port on the suction line and tighten to 8 ft-lb
6. Attach the TXV bulb at the 10 to 2 o’clock position on
the suction line outside the cabinet no more than one
foot from the coil
7. Insulate the bulb
Figure 3. Condensate Drain
Figure 2. Metering Device Installation
Refrigerant Line Sets
• Line set size must be selected per the outdoor unit
instructions
• Brazed connections MUST be purged with nitrogen
during brazing
• Service valves MUST be wrapped with wet rag during
brazing
• Line sets MUST be sealed at all times until brazed to
prevent contaminants
• Suction line MUST be insulated
System Vacuum
After brazing and before releasing/adding charge into
the system, the system MUST be evacuated to at least
500 microns with a refrigeration vacuum pump. After
evacuation, shut off the pump and monitor the vacuum
gauge to ensure that the system is holding the vacuum.
When it is time to release the charge from the outdoor unit
into the system, always slowly open the suction service
valve rst before opening the liquid service valve.
65821003 / 40228K016Issue 1810Page 4 of 6
System Charging
The system MUST be charged per the outdoor unit
installation instructions.
Condensate Drain
Coils are equipped with multiple drain connections.
Determine the drain connections to be used and note the
difference between the primary (green) and secondary
(red) openings. Drain plugs are provided for all openings;
remove and discard the appropriate plugs with 1/2” drive
ratchet and verify that remaining plugs are tight (2.5 ft-lbs).
Attach drain line to pan with 3/4” male pipe thread PVC
ttings. Hand tight is adequate - do not over tighten and
do not reduce drain line size.
Route drain line(s) so they will not be exposed to freezing
temperatures and do not interfere with accessibility to
the coil, air handling system or lter. The drain should be
pitched downward 1” per 10” with a 2” trap as close to
the coil as possible. If line makes a second trap, or has
an extended run before termination, a vent tee should be
installed after the trap closest to the pan. See Figure 3.
If the coil is located in or above a living space where
damage may result from condensate overow, a separate
3/4” drain must be provided from the secondary drain
connection. Run this drain to a place in compliance with
local installation codes where it will be noticed when unit
is operational. Condensate owing from the secondary
drain indicates a plugged primary drain. Prime the trap
with water. Test line for leaks. Test water ow with unit in
operation. An auxiliary drain pan should also be installed
under the unit as specied by most local building codes.
Upow Installation
FURNACE
Remove
Horizontal
Drain Pan
Air Flow
Figure 4. Upow Installation
• When the indoor coil is installed with a furnace unit, it
is highly recommended to use the same width coil as
the furnace
• Install coil with slight slope towards the drain connection
• Remove auxiliary (horizontal) drain pans from the coil
cabinet for upow installation
WARNING
The drain pan is made of material that can withstand
450°F. However, the clearance between the furnace and
the drain pan must be 4 inches for an oil furnace or 2
inches for a gas furnace.
• Apply foil face tape around the entire cabinet to prevent
air leaks and insulate the suction line
Downow Installation
Remove
Horizontal
Drain Pan
Air Flow
FURNACE
Figure 5. Downow Installation
• When the indoor coil is installed with a furnace unit, it
is highly recommended to use the same width coil as
the furnace
• Install coil with slight slope towards the drain connection
• Remove auxiliary (horizontal) drain pans from the coil
cabinet for downow installation
• Airow face velocity above 350 ft/min is not
recommended due to potential for water blow-off
WARNING
Water shields must be installed on all downow
applications on the inside of the drain pan on both sides
of the coil (downow kit).
IMPORTANT
Use foil face tape to secure the top edge of the coil
insulation to the cabinet to prevent delamination and air
ow blockage.
65821003 / 40228K016 Issue 1810 Page 5 of 6
• Apply foil face tape around the entire cabinet to
prevent air leaks
Water
Shields
Evaporator Coil
Figure 6. Water Shield Installation
Horizontal Installation
• For installation above ceilings, a secondary drain
pan with overow switch must be installed and must
comply with local codes
• When the indoor coil is installed with a furnace unit, it
is highly recommended to use the same width coil as
the furnace
• Install coil with slight slope towards the drain
connection and level with the furnace
• Do not remove auxiliary (horizontal) drain pans from
the coil cabinet. Position the drain pan according to the
horizontal position installation (right or left position). It
is most preferred and most efcient that the outlet of
the furnace be facing the bottom of the coil instead of
the top of the coil
• Install splash guard at the coil outlet as shown
(included with horizontal coils)
• Air ow should be set for 350 CFM per ton or as rated
for the matched system
Air Flow
Figure 7. Horizontal Left Installation
Air Flow
Figure 8. Horizontal Right Installation
Horizontal Conversion (Right or Left)
See Figure 10
• Remove front panels (1) and slide coil outside the
cabinet
• Remove horizontal pan (3) and re-install on the
opposite side
• Remove top plate (4) and reverse the position of the
diverter plate (5) as shown. This will allow the water to
slope downwards towards the middle of the coil inside
the horizontal drain pan
4
6
5
3
8
7
2 & 9
1
11
10
12
Note: Access panel may
need to be notched
to allow access to
suction header
Figure 10. Horizontal Conversion
65821003 / 40228K016Issue 1810Page 6 of 6
CAUTION
The water diverter plate (5) must be positioned
downwards facing the direction of air ow. Failure to
do so can cause water blow off and possible structure
damage.
Slope
down
Air Flow
5
Figure 9. Position Water Diverter Plate
• Replace the top plate (6) and seal any air gaps
• Cut front ange (7) and fold back to allow access to
the horizontal drain connections
• Install the coil back into the cabinet and the piping
panel (10)
• Knock out new access openings for the drain lines (11)
• Install the door and seal any unused holes (8 & 12) to
prevent air leakage
• Install splash guard at the coil outlet as shown to
prevent water blow off
Splash Guard Installation
Fasten splash guard to duct flanges with (4)
sheet metal screws, (2) on each side. Screws
can be installed from the inside or outside.
Angle splashguard to ensure
proper water drainage back
into horizontal drain pan.
Splashguard should
overlap the horizontal
drain pan by at least 4”.
4” min.
Figure 11. Splash Guard Installation
• Apply foil face tape around the entire cabinet to prevent
air leaks and insulate the suction line
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